//  Copyright (c) 2007-2017 Hartmut Kaiser
//
//  SPDX-License-Identifier: BSL-1.0
//  Distributed under the Boost Software License, Version 1.0. (See accompanying
//  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

#pragma once

// hpxinspect:noinclude:HPX_PP_NARGS

#include <hpx/preprocessor/expand.hpp>

/// Expands to the number of arguments passed in
///
/// \param ... The variadic number of arguments
///
/// Example Usage:
/// \code
/// HPX_PP_NARGS(hpx, pp, nargs)
/// HPX_PP_NARGS(hpx, pp)
/// HPX_PP_NARGS(hpx)
/// \endcode
///
/// Expands to:
/// \code
/// 3
/// 2
/// 1
/// \endcode
#define HPX_PP_NARGS(...)                                                      \
    HPX_PP_EXPAND(HPX_PP_ARGN_(__VA_ARGS__, 63, 62, 61, 60, 59, 58, 57, 56,    \
        55, 54, 53, 52, 51, 50, 49, 48, 47, 46, 45, 44, 43, 42, 41, 40, 39,    \
        38, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22,    \
        21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3,   \
        2, 1, 0))                                                              \
/**/
/// \cond NOINTERNAL
#define HPX_PP_ARGN_(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13,   \
    _14, _15, _16, _17, _18, _19, _20, _21, _22, _23, _24, _25, _26, _27, _28, \
    _29, _30, _31, _32, _33, _34, _35, _36, _37, _38, _39, _40, _41, _42, _43, \
    _44, _45, _46, _47, _48, _49, _50, _51, _52, _53, _54, _55, _56, _57, _58, \
    _59, _60, _61, _62, _63, N, ...)                                           \
    N /**/
/// \endcond
